Radii-averaging instrument.



E. G. BAILEY.

RADH AVERAGING INSTRUMENT.

APPLICATION FILED DE0.Is,1s1a.

1,107,740. Patented Aug. 18, 1914 vcular chart.

is for the same purpose as that of the in-V ERVIN G. BAILEY, or NEWTON HIGHLANDS, MASSACHUSETTS..

RADII-AVERAGIN G LSTRUMENT.

Specificativoxirof Letters Patent,

Patented Aug. 1 8, 19114.

Application filed December 18., 1,913.; Serial No. 807,554.

To all whom it may concern:

Be it known that I, havin G. BAILEY, a citizen .of the United States, residing in Newton Highlands, in the county of Suffolk and State of Massachusetts, have inventedan Improvement in Radii-Aver'aging Instruments, of which the following description, in connection with the accoiiipanying drawings, is a specification, like-letters on the drawings representing like parts.

The present invention relates to a' radii averaging instrument, and is embodied in an instrument adapted to be used to determine the mean radial ordinalc of' :i record or diagram drawn to polar coordinates on a ciraXis of which is adapted to be maintained substantially parallel to the radius ot the chart which passes through the point of con tact between the disk and the. chart, the said disk being adapted to be rotated by peripheral contact with the chart, as the tracer point follows the record. i

The instrument'embodying the invention struments shown and deseribedin prior Letters Patent of the United States, No.

' 927,328, to William F. Durand, July G, 1909,

and No. 938,962, to William H. Bristol, No-V vember 2, 1909; but' it has novel features of construction and'v arrangement in which it differs `from the instruments shown in thepatents cited, and whichconstitute important improvements.

Figure 1 is a perspective view of the instrument embodying the invention; and Fig. 2 is a similar view showing a modification.

The instrument is herein shown as consisting of a support 1 having a iat surface to receive .the chart 2 which is located .a definite position with relation to the support. The integrating wheel 3 ismounted on' an arm 4, the said arm having avpivotal bearing 6 perpendicular to the surface of the Support, and the said arm and'its bearing are s0 arranged with relation to the axis of the chart that the axis of the wheel 3'1s always substantially parallel to that radius of the chart which passes through the point of Contact between thechart and the wheel.

In the construction shown in Fig. 1, the perpendicular support for the arm. it is shown as the vertical-pivot 6 .on a link 5a which is pivoted at the opposite end on a perpendicular Support 5 concentric with the The integratingpoi-tion of theV instrument consists of a wheel or disk, the" Jhart,the' integrating wheel 3 being-supportedfon a pivotal bearing at'ftlie-'e'nd of the arm I remote from. 'the Aperpenilicular support. In this instrument, the rotation of vthe integrating wheel can bebrought about bymoving the lvvheelwith relation to the chart or the chart :with .relation to the wheef, it being obvious that the ,-pivotwill .always-be at a fixed' distance .from the center of the chart. The tracer-''..extendsdownward from the axis of the Wheelfto'fa point near the surface of Athechart, the pointof t-he said tracer preferably being close to the place Where the wheel lies in Contact with .the ch-art. W-hilel baveishown the., perpenf;

dicular support 5 for the link 5 as part of a post utilized to center and hold the chart, it is obvious that the chart can be-positioned and fastened in any suitable way, and the perpendicular support for the vlink likewise provided for.. i

In the construction shown. in Fig. 2, the arm 4 has a stationary perpendicular axis which consists of a post 8 permanently secured to the support 1 at a point remote from the center of the chart, the pivot 6a at the top of the post being the equivalent of the pivot 6. In this case, it is necessary to rotate the chart with relation to the wheel and I have shown the support 1 as provided with a; vertical post 9 which constitutes a centering guide around which the chart can be rotated. In view of the fact that the arin 4 is pivotally supported, the lateral movement of the wheel 3 is not exactlyradial to the center of the chart; but' since the pivotal support for that part of the arm which carries the wheel is at a distance from the center of the chart, the small portion of the are along which the wheel travels, so closely coincides with the radius of' the chart that the error is negligible in the use of the instrument. l

The angular rotation 'of the wheel by its peripheral contact with the chart, while the tracer is caused to follow the diagram, is substantially proportional to the mean radius of the diagram, and the result can be indicated in any suitable Way. In the construction shown, the arm which carries the wheel also carries an indicating pointer, which cooperates with a graduated scale 10 near the periphery of the .wheel itself,

IVhat I claim is: 1. A radii averaging instrument comprising a support havingmeans for definitely positioning a circular chart thereon; an arm pivoted on an axis substantially perpendicular to the surface of said support; a tracing pointer-connected with said arm; an inte` grating wheel rotatably pivoted to said arm on an axis substantially parallel to the ra-.. dius of the chart which passes through' the point of contact between said chart and said Wheel, means whereby the axis on which the arm is pivoted is maintained equidistant from the axis of the chart and the integrating wheel equidistant from the axis of the arm.

2. A radii averaging instrument for circular chart records. comprising a support for a chart; an arm pivoted at one end about an axis substantially perpendicular to said support and at a fixed distance from the center ofthe chart; a tracing pointer fastened to said arm; and an integrating wheel rotatably pivoted to said arm. the axis of said wheel being substantiall)v parallel to the radius of the chart passing through the point of contact with said wheel.

3. A radii averaging instrument for circular chart records, comprising a support for a chart; means for holdingtthe center of the chart in a definite position on said support; a link pivoted at one end about the axis of the chart; an arm pivoted to the` other end of. said link; a tracing pointer fas.

tened to the outer end of said arm; and an integrating wheel rotatably pivoted to the outer end of said arm, the axis of said wheel being substantially parallel to the radius of the chart passin through the point of contact with said w eel.

In testimony whereof, I have signcdmy name to this specificationin the presence of two subscribing Witnesses.

ERVIN G. BAILEY. Wtness:

J As. J. MAnoNEr, M. L. lVlALoNEY. 

